An interesting article that I would like to share with you.
Social networking web-sites allow registered users to upload profiles, post comments, join "networks" and add "friends." They give registered users the opportunity to form "links" between each other based on friendships, hobbies, personal interests, and business sector or academic affiliations. Social networking sites can be used both personally, to contact friends and find old classmates, and professionally, to look for employment or find someone with whom to collaborate. Most social networking systems are available to all users. Some are available by invitation (or special qualification) only. Most began with a personal focus on linking "friends," but many now focus on both business and personal networking.
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